Railway communication system and railway communication method

Abstract

Considering that an increase in the future is expected in applications related to communication and the amount of communication in railway ground-vehicle communication, in order to solve the problem of a high cost for providing a communication facility for each application, in a railway communication system for transmitting data of a plurality of applications between a ground facility and an on-vehicle facility using the same wireless network, an on-vehicle wireless control unit included in the on-vehicle facility has a function of monitoring a communication environment, a function of setting a transmission priority of each of the plurality of applications, and a function of performing packet control of the data based on the communication environment and the transmission priority.

1 . A railway communication system for transmitting data of a plurality of applications between a ground facility and an on-vehicle facility using the same wireless network, wherein
 an on-vehicle wireless control unit included in the on-vehicle facility has
 a function of monitoring a communication environment, 
 a function of setting a transmission priority of each of the plurality of applications, and 
 a function of performing packet control of the data based on the communication environment and the transmission priority. 
   
     
     
         2 . The railway communication system according to  claim 1 , wherein
 the wireless network is a public wireless network.   
     
     
         3 . The railway communication system according to  claim 1 , wherein
 the function of setting a transmission priority for each of the plurality of applications is a function of setting a transmission priority for each of the applications in real time in accordance with a status generated inside the application.   
     
     
         4 . The railway communication system according to  claim 1 , wherein
 the function of setting a transmission priority for each of the plurality of applications is a function of setting a transmission priority for each of the applications in accordance with a traveling position of a vehicle equipped with the on-vehicle facility.   
     
     
         5 . The railway communication system according to  claim 1 , wherein
 the function of setting a transmission priority for each of the plurality of applications is a function of setting a transmission priority for each of the applications in accordance with an operation section in which a vehicle equipped with the on-vehicle facility travels.   
     
     
         6 . The railway communication system according to  claim 1 , wherein
 the function of performing packet control of the data based on the communication environment and the transmission priority is a function of stopping transmission of data having a low transmission priority when the communication environment is deteriorated.   
     
     
         7 . The railway communication system according to  claim 1 , wherein
 the function of performing packet control of the data based on the communication environment and the transmission priority is a function of increasing a transmission cycle of data having a low transmission priority when the communication environment is deteriorated.   
     
     
         8 . The railway communication system according to  claim 1 , wherein
 the plurality of applications include at least one of:
 an application configured to monitor, by video, whether an on-vehicle apparatus of a vehicle equipped with the on-vehicle facility is normal; and 
 a security application configured to perform operation control of a train including a vehicle equipped with the on-vehicle facility. 
   
     
     
         9 . A railway communication method for transmitting data of a plurality of applications between a ground facility and an on-vehicle facility using the same wireless network, the railway communication method comprising:
 on the on-vehicle facility side, monitoring a communication environment, setting a transmission priority for each of the plurality of applications, and performing packet control of the data based on the communication environment and the transmission priority.   
     
     
         10 . The railway communication method according to  claim 9 , wherein
 the transmission priority of each of the plurality of applications is set in real time in accordance with a status generated inside the application.   
     
     
         11 . The railway communication method according to  claim 9 , wherein
 the transmission priority of each of the plurality of applications is set in accordance with a traveling position of a vehicle equipped with the on-vehicle facility.   
     
     
         12 . The railway communication method according to  claim 9 , wherein
 the transmission priority of each of the plurality of applications is set in accordance with an operation section in which a vehicle equipped with the on-vehicle facility travels.   
     
     
         13 . The railway communication method according to  claim 9 , wherein
 the packet control of the data is stopping transmission of data having a low transmission priority when the communication environment is deteriorated.   
     
     
         14 . The railway communication method according to  claim 9 , wherein
 the packet control of the data is increasing a transmission cycle of data having a low transmission priority when the communication environment is deteriorated.